<template>
<!-- // 注意我addForm打成了addFrom -->
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 头部的警告区域 -->
        <el-alert
        title="注意：只允许第三级分类设置的相关参数"
        type="warning"
        closable
        show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品商品分类的级联 -->
          <el-cascader
          v-model="selectedCateKeys"
          :options="cateList"
          expand-trigger="hover"
          :props="cateProps"
          @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleCateClick">
        <!-- 添加动态参数 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisableP" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <!-- 循环列表渲染tag -->
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>

          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisableP" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <!-- 循环列表渲染tag -->
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>

          </el-table>
        </el-tab-pane>
      </el-tabs>

      <!-- 添加参数的对话框 -->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed"
        >
        <!-- 添加参数的对话框 -->
        <el-form :model="addFrom" :rules="addFromRules" ref="addFromRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addFrom.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
      <!-- 编辑对话框 -->
      <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed"
        >
        <!-- 添加参数的对话框 -->
        <el-form :model="editFrom" :rules="editFromRules" ref="editFromRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editFrom.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </el-card>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单验证对象
      addFrom: {
        attr_name: ''
      },
      addFromRules: {
        attr_name: [
          { required: true, message: '请输入参数', trigger: 'blur' }
        ]
      },
      // 控制修改编辑对话框的显示与隐藏
      editDialogVisible: false,
      // 修改对话框的数据对象
      editFrom: {},
      editFromRules: {
        attr_name: [
          { required: true, message: '请输入参数', trigger: 'blur' }
        ]
      }
      // 控制按钮和文本框的显示
    }
  },
  created() {
    // 获取所有的商品分类
    this.getCateList()
  },
  computed: {
    // 如果按钮需要被禁用，返回ture,否则为Flase
    isBtnDisableP() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级ID
    cateID() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data
      // console.log(this.cateList)
    },
    // 级联选择框变化时，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签的点击事件
    handleCateClick() {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数组
    async getParamsData() {
      // console.log(this.selectedCateList)
      // 如果选中的长度不是3，那么清空
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
      }
      // console.log(this.selectedCateKeys)
      // 根据所选的分类ID，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateID}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      // console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭
    addDialogClosed() {
      this.$refs.addFromRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateID}/attributes`, {
          attr_name: this.addFrom.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示编辑的对话框的显示
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(`categories/${this.cateID}/attributes/${id}`,
        {
          params: { attr_sel: this.attr_sel }
        }
      )
      if (res.meta.status !== 200) {
        this.$message.error('获取参数请求失败')
      }
      this.editFrom = res.data
      this.editDialogVisible = true
    },
    // 重置修改的内容
    editDialogClosed() {
      this.$refs.editFromRef.resetFields()
    },
    // 提交修改的内容
    editParams() {
      this.$refs.editFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateID}/attributes/${this.editFrom.attr_id}`,
          { attr_name: this.editFrom.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }

        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应的参数项
    async removeParams(id) {
      // 弹框询问是否删除
      // console.log(id.cat_id)
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除，则返回值为确认字符串
      // 取消为cancel 确认为confirm
      // console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateID}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点或按下enter触发
    async handleInputConfirm(row) {
      row.inputVisible = false
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有让return，则证明输入内容，需要后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求保存
      this.saveAttrVals(row)
    },
    // 点击按钮，展示输入文本框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick：就是当页面的元素被重新渲染后，才会执行后面的回调函数
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 讲对attr_vals保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateID}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        }
      )
      if (res.meta.status !== 200) {
        this.$message.error('修改参数请求失败')
      }
      this.$message.success('修改参数请求成功')
    },
    // 删除对应的参数和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 5px;
}
.input-new-tag{
  width: 120px;
}
</style>
